Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 15270587 authored by Zhangfei Gao's avatar Zhangfei Gao Committed by Philipp Zabel
Browse files

reset: hisilicon: add reset-hi3660 



Add hi3660 reset driver
Example of dts usage:
	iomcu_rst: iomcu_rst_controller {
		compatible = "hisilicon,hi3660-reset";
		hisi,rst-syscon = <&iomcu>;
		#reset-cells = <2>;
	};

	i2c0: i2c@..... {
                ...
		resets = <&iomcu_rst 0x20 3>; /* offset: 0x20; bit: 3 */
                ...
        };

Signed-off-by: default avatarZhangfei Gao <zhangfei.gao@linaro.org>
Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
parent 836e2354

drivers/reset/hisilicon/Kconfig

+7 −0
Original line number Original line Diff line number Diff line 
config COMMON_RESET_HI3660

	tristate "Hi3660 Reset Driver"

	depends on ARCH_HISI || COMPILE_TEST

	default ARCH_HISI

	help

	  Build the Hisilicon Hi3660 reset driver.



config COMMON_RESET_HI6220

config COMMON_RESET_HI6220

	tristate "Hi6220 Reset Driver"

	tristate "Hi6220 Reset Driver"

	depends on ARCH_HISI || COMPILE_TEST

	depends on ARCH_HISI || COMPILE_TEST

drivers/reset/hisilicon/Makefile

+1 −0
Original line number Original line Diff line number Diff line 
obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o

obj-$(CONFIG_COMMON_RESET_HI6220) += hi6220_reset.o

obj-$(CONFIG_COMMON_RESET_HI3660) += reset-hi3660.o

drivers/reset/hisilicon/reset-hi3660.c

0 → 100644
+126 −0
Original line number Original line Diff line number Diff line 
/*

 * Copyright (c) 2016-2017 Linaro Ltd.

 * Copyright (c) 2016-2017 HiSilicon Technologies Co., Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 */

#include <linux/kernel.h>

#include <linux/mfd/syscon.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/reset-controller.h>



struct hi3660_reset_controller {

	struct reset_controller_dev rst;

	struct regmap *map;

};



#define to_hi3660_reset_controller(_rst) \

	container_of(_rst, struct hi3660_reset_controller, rst)



static int hi3660_reset_program_hw(struct reset_controller_dev *rcdev,

				   unsigned long idx, bool assert)

{

	struct hi3660_reset_controller *rc = to_hi3660_reset_controller(rcdev);

	unsigned int offset = idx >> 8;

	unsigned int mask = BIT(idx & 0x1f);



	if (assert)

		return regmap_write(rc->map, offset, mask);

	else

		return regmap_write(rc->map, offset + 4, mask);

}



static int hi3660_reset_assert(struct reset_controller_dev *rcdev,

			       unsigned long idx)

{

	return hi3660_reset_program_hw(rcdev, idx, true);

}



static int hi3660_reset_deassert(struct reset_controller_dev *rcdev,

				 unsigned long idx)

{

	return hi3660_reset_program_hw(rcdev, idx, false);

}



static int hi3660_reset_dev(struct reset_controller_dev *rcdev,

			    unsigned long idx)

{

	int err;



	err = hi3660_reset_assert(rcdev, idx);

	if (err)

		return err;



	return hi3660_reset_deassert(rcdev, idx);

}



static struct reset_control_ops hi3660_reset_ops = {

	.reset    = hi3660_reset_dev,

	.assert   = hi3660_reset_assert,

	.deassert = hi3660_reset_deassert,

};



static int hi3660_reset_xlate(struct reset_controller_dev *rcdev,

			      const struct of_phandle_args *reset_spec)

{

	unsigned int offset, bit;



	offset = reset_spec->args[0];

	bit = reset_spec->args[1];



	return (offset << 8) | bit;

}



static int hi3660_reset_probe(struct platform_device *pdev)

{

	struct hi3660_reset_controller *rc;

	struct device_node *np = pdev->dev.of_node;

	struct device *dev = &pdev->dev;



	rc = devm_kzalloc(dev, sizeof(*rc), GFP_KERNEL);

	if (!rc)

		return -ENOMEM;



	rc->map = syscon_regmap_lookup_by_phandle(np, "hisi,rst-syscon");

	if (IS_ERR(rc->map)) {

		dev_err(dev, "failed to get hi3660,rst-syscon\n");

		return PTR_ERR(rc->map);

	}



	rc->rst.ops = &hi3660_reset_ops,

	rc->rst.of_node = np;

	rc->rst.of_reset_n_cells = 2;

	rc->rst.of_xlate = hi3660_reset_xlate;



	return reset_controller_register(&rc->rst);

}



static const struct of_device_id hi3660_reset_match[] = {

	{ .compatible = "hisilicon,hi3660-reset", },

	{},

};

MODULE_DEVICE_TABLE(of, hi3660_reset_match);



static struct platform_driver hi3660_reset_driver = {

	.probe = hi3660_reset_probe,

	.driver = {

		.name = "hi3660-reset",

		.of_match_table = hi3660_reset_match,

	},

};



static int __init hi3660_reset_init(void)

{

	return platform_driver_register(&hi3660_reset_driver);

}

arch_initcall(hi3660_reset_init);



MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:hi3660-reset");

MODULE_DESCRIPTION("HiSilicon Hi3660 Reset Driver");